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Mount Prospect, Illinois 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Mount Prospect IL
National Weather Service Forecast for: Mount Prospect IL
Issued by: National Weather Service Chicago, IL
Updated: 2:21 am CDT May 8, 2026
 
Overnight

Overnight: Partly cloudy, with a low around 38. West northwest wind around 5 mph.
Partly Cloudy

Friday

Friday: Partly sunny, with a high near 67. South southeast wind 5 to 10 mph, with gusts as high as 15 mph.
Partly Sunny

Friday
Night
Friday Night: Partly cloudy, with a low around 50. South southwest wind 5 to 10 mph.
Partly Cloudy

Saturday

Saturday: A 20 percent chance of showers after 2pm.  Mostly sunny, with a high near 72. West wind 10 to 15 mph, with gusts as high as 25 mph.
Mostly Sunny
then Slight
Chance
Showers
Saturday
Night
Saturday Night: Partly cloudy, with a low around 46. North wind 5 to 10 mph, with gusts as high as 15 mph.
Partly Cloudy

Sunday

Sunday: Mostly sunny, with a high near 62.
Mostly Sunny

Sunday
Night
Sunday Night: Partly cloudy, with a low around 42.
Partly Cloudy

Monday

Monday: Sunny, with a high near 57.
Sunny

Monday
Night
Monday Night: Partly cloudy, with a low around 42.
Partly Cloudy

Lo 38 °F Hi 67 °F Lo 50 °F Hi 72 °F Lo 46 °F Hi 62 °F Lo 42 °F Hi 57 °F Lo 42 °F

Hazardous Weather Outlook
 

Overnight
 
Partly cloudy, with a low around 38. West northwest wind around 5 mph.
Friday
 
Partly sunny, with a high near 67. South southeast wind 5 to 10 mph, with gusts as high as 15 mph.
Friday Night
 
Partly cloudy, with a low around 50. South southwest wind 5 to 10 mph.
Saturday
 
A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 72. West wind 10 to 15 mph, with gusts as high as 25 mph.
Saturday Night
 
Partly cloudy, with a low around 46. North wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday
 
Mostly sunny, with a high near 62.
Sunday Night
 
Partly cloudy, with a low around 42.
Monday
 
Sunny, with a high near 57.
Monday Night
 
Partly cloudy, with a low around 42.
Tuesday
 
Showers likely. Mostly cloudy, with a high near 63.
Tuesday Night
 
Showers likely. Mostly cloudy, with a low around 46.
Wednesday
 
Partly sunny, with a high near 63.
Wednesday Night
 
Partly cloudy, with a low around 46.
Thursday
 
Mostly sunny, with a high near 72.

 

Forecast from NOAA-NWS for Mount Prospect IL.

Weather Forecast Discussion
273
FXUS63 KLOT 080502
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
1202 AM CDT Fri May 8 2026

.KEY MESSAGES...

- Occasional chances for scattered rain showers will continue
  into next week.

- Temperatures will gradually warm through Saturday before
  trending cooler early next week.

&&

.DISCUSSION...
Issued at 111 PM CDT Thu May 7 2026

Expansive upper-level cyclonic flow remains entrenched across
the Upper Mississippi River Valley, which is leading to a
continuation of the generally cool and, at times, showery
pattern. An upper-level shortwave propagating around the outer
periphery of the cyclonic flow continues to pivot southeastward
across the area this afternoon, which with steep lapse rates
(500mb temperatures sampled near -28C on the 18Z DVN RAOB), is
supporting widely scattered showers at press time. The highest
coverage of showers through the afternoon and evening should
generally favored near and south of I-80 (near a remnant
boundary) and near the Wisconsin state line (near the core of
the coldest mid-level temperatures). Southwest winds will
remain gusty (30 to locally 40 mph) this afternoon, especially
near showers where the deep layer of dry sub-cloud air will lead
to efficient downward momentum transfer.

Tonight, coverage of showers should tend to favor areas south
of Interstate 80 as additional subtle DCVA rides atop the
aforementioned frontal boundary. A gradient in cloud cover will
set the stage for a gradient in overnight lows, with values
expected to fall toward the mid to upper 30s near the Wisconsin
state line to the upper 40s near US-24. Patchy frost formation
will be favored north of Interstate 88 and especially near the
Wisconsin state line, though will withhold a Frost Advisory
given the expectation for upper-level clouds to thicken toward
daybreak (which may stall the downward dive in temperatures).

Tomorrow, another upper-level shortwave will pinwheel through
the upper-level cyclonic flow and support the development of
showers and perhaps a thunderstorm along the stalled frontal
boundary. Forecast guidance continues to exhibit spread in the
location of the boundary by tomorrow afternoon, though have
noted a slight southward trend in the latest guidance. As a
result, will paint low-end chance (20-40%) PoPs south of I-80
tomorrow, with the highest values near US-24. Elsewhere, partly
cloudy skies and a modest push of low-level warm-air advection
will help boost highs into the mid to upper 60s. Yet another
upper-level shortwave will move across the region on Saturday,
presenting another opportunity for a few showers. Temperatures
on Saturday look to be the warmest of the past few days with
highs in the upper 60s (north) to mid 70s (south).

Another reinforcing shot of seasonably cool air will follow the
front Saturday night and result in a swift return to somewhat
below average temperatures Sunday into the beginning of next
week. With that said, ensemble guidance continues to advertise a
strong signal for a notable warming trend by the May 16 to 17
timeframe, which is in line with climatology.

Borchardt / Izzi

&&

.AVIATION /06Z TAFS THROUGH 12Z SATURDAY/...
Issued at 1202 AM CDT Fir May 8 2026

There are no  aviation weather concerns anticipated through the
period.

VFR conditions are expected through the period as the focus for
showers today remains south of the terminals. Winds will be
light (5 kt or less) and somewhat variable this morning, but
directions should gradually focus into a south-southwesterly
direction at 7 to 10 kt for the afternoon and evening hours of
today. While we will have to keep an eye on the evolution of the
lake breeze boundary this afternoon, all indications at this
time continue to point at it remaining east of the main Chicago
terminals.

KJB

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...None.

&&

$$

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